SIMBAD references

2000MNRAS.319..991S - Mon. Not. R. Astron. Soc., 319, 991-1000 (2000/December-3)

NGC 1333/IRAS 4: a multiple star formation laboratory.

SMITH K.W., BONNELL I.A., EMERSON J.P. and JENNESS T.

Abstract (from CDS):

We present SCUBA observations of the protomultiple system NGC 1333/IRAS 4 at 450 and 850µm. The 850-µm map shows significant extended emission which is most probably a remnant of the initial cloud core. At 450µm, the component 4A is seen to have an elongated shape suggestive of a disc. Also we confirm that, in addition to the 4A and 4B system, there exists another component 4C, which appears to lie out of the plane of the system and of the extended emission. Deconvolution of the beam reveals a binary companion to IRAS 4B. Simple considerations of binary dynamics suggest that this triple 4A-4BI-4BII system is unstable and will probably not survive in its current form. Thus IRAS 4 provides evidence that systems can evolve from higher to lower multiplicity as they move towards the main sequence. We construct a map of spectral index from the two wavelengths, and comment on the implications of this for dust evolution and temperature differences across the map. There is evidence that in the region of component 4A the dust has evolved, probably by coagulating into larger or more complex grains. Furthermore, there is evidence from the spectral index maps that dust from this object is being entrained in its associated outflow.

Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): binaries: general - circumstellar matter - stars: formation MNRAS.381..441

Nomenclature: [JCC87] IRAS ANA (Nos 4B1, 4B2) added.

CDS comments: Components [JCC87] IRAS 4BI and 4BII are [JCC87] IRAS 4B1 and 4B2 in SIMBAD.

Simbad objects: 5

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